Comment on “Doubly hybrid density functional xDH-PBE0 from a parameter-free global hybrid model PBE0” [J. Chem. Phys. 136, 174103 (2012)]

Comment on “Doubly hybrid density functional xDH-PBE0 from a parameter-free global hybrid model PBE0” [J. Chem. Phys. 136, 174103 (2012)]